Mon·Aug 25, 2014Monday·August 25, 2014

1. 01*

   Comment on 'Comparative study of beta-decay data for eight nuclides measured at the Physikalisch-Technische Bundesanstalt' [Astropart. Phys., 50, 47-58]

   Ole Nähle · Karsten Kossert

   We would like to comment on a recent paper by Sturrock et al. [1] in which the authors analyze decay data acquired by an ionization chamber in our institute. They interpret the variations in the data as solar-driven changes in the decay rates of the radionuclides under study. In brief we would like to discuss and elucidate the properties and the origin of the data used by the authors and explain why these data are not a sound basis for claiming evidence for new physics.

   nucl-exastro-ph.SRAstropart.Phys.(2015)·14 citations
2. 02*

   E12-14-009: Ratio of the electric form factor in the mirror nuclei 3He and 3H

   L.S Myers🇺🇸 · D.W. Higinbotham🇺🇸 · J.R. Arrington🇺🇸

   E12-14-009: We propose to extract the ratio of the electric form factor (G_E) of 3He and 3H from the measured ratio of the elastic-scattering cross sections at E_beam = 1.1 GeV. Measurements at low Q^2 ( < 0.1 GeV^2) will allow accurate extraction of G_E with minimal contributions from the magnetic form factor (G_M) and Coulomb corrections. From this data we will extract the difference between the charge radii for 3He and 3H. This short experiment, 1.5 days, will utilize the left Hall A high resolution spectrometer and the one-time availability of a 1 kCi tritium target at Jefferson Lab which has been approved for the E12-10-103, E12-11-112 and E12-14-011 experiments.

   nucl-ex4 citations
3. 03*

   Structure of Krypton isotopes calculated with symmetry conserving configuration mixing methods

   Tomás R. Rodríguez🇩🇪

   Shape transitions and shape coexistence in the ${}^{70-98}$Kr region are studied in a unified view with state-of-the-art beyond self-consistent mean field methods based on the Gogny D1S interaction. Beyond mean field effects are taken into account through the exact angular momentum and particle number restoration and the possibility of axial and non-axial shape mixing. The results of the low-lying properties of these isotopes are in good agreement with the experimental data when the triaxial degree of freedom is included. Shape transitions from axial-oblate (${}^{70-72}$Kr) to triaxial-prolate (${}^{74-78}$Kr) and from spherical-triaxial (${}^{86-92}$Kr) to axial-oblate (${}^{94-98}$Kr) ground states are obtained. Additionally, low-lying $0^{+}$ excited states and quasi-gamma bands are found showing the richness of the collective structure in this region.

   ↳ nucl-thnucl-exPRC(2014)·75 citations
4. 04*

   Pair production of quarkonia and electroweak bosons from double-parton scatterings in nuclear collisions at the LHC

   David d'Enterria🇨🇭 · Alexander M. Snigirev🇷🇺

   Cross sections for the concurrent production of pairs of quarkonia (J/psi, Upsilon) and/or gauge bosons (W, Z) from double-parton scatterings (DPS) in high-energy proton-nucleus and nucleus-nucleus collisions at the LHC are calculated. The estimates are based on next-to-leading-order perturbative QCD predictions, including nuclear modifications of the parton densities, for the corresponding single-scattering cross sections. Expected event rates for J/psi+J/psi, J/psi+Upsilon, J/psi+W, J/psi+Z, Upsilon+Upsilon, Upsilon+W, Upsilon+Z, and same-sign W+W production in their (di)leptonic decay modes, after typical acceptance and efficiency losses, are given for pPb and PbPb collisions.

   ↳ hep-phhep-exnucl-exnucl-thNPA(2014)·19 citations
5. 05*

   Recent lattice QCD results and phase diagram of strongly interacting matter

   Heng-Tong Ding🇨🇳

   I review recent lattice QCD results on a few selected topics which are relevant to the heavy ion physics community. Special emphasis is put on the QCD equation of state at vanishing and nonzero baryon chemical potential, the onset of deconfinement of open strange and charmed hadrons, the contribution from experimentally not yet observed hadrons to the thermodynamics of the hadronic gas and their influence on freeze-out conditions of strange and light-quark hadrons.

   ↳ hep-latnucl-exnucl-thNPA(2014)·20 citations
6. 06*

   Single electron detection and spectroscopy via relativistic cyclotron radiation

   D.M. Asner🇺🇸 · R.F. Bradley🇺🇸 · L. de Viveiros🇺🇸 · P.J. Doe🇺🇸 · J.L. Fernandes🇺🇸 · M. Fertl🇺🇸 · E.C. Finn🇺🇸 · J. A. Formaggio🇺🇸 · D. Furse🇺🇸 · A. M. Jones🇺🇸 · J. N. Kofron🇺🇸 · B. H. LaRoque🇺🇸 and 15 other authors

   It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Cyclotron radiation, the particular form of radiation emitted by an electron orbiting in a magnetic field, was first derived in 1904. Despite the simplicity of this concept, and the enormous utility of electron spectroscopy in nuclear and particle physics, single-electron cyclotron radiation has never been observed directly. Here we demonstrate single-electron detection in a novel radiofrequency spec- trometer. We observe the cyclotron radiation emitted by individual magnetically-trapped electrons that are produced with mildly-relativistic energies by a gaseous radioactive source. The relativistic shift in the cyclotron frequency permits a precise electron energy measurement. Precise beta elec- tron spectroscopy from gaseous radiation sources is a key technique in modern efforts to measure the neutrino mass via the tritium decay endpoint, and this work demonstrates a fundamentally new approach to precision beta spectroscopy for future neutrino mass experiments.

   ↳ physics.ins-dethep-exnucl-exPRL(2015)·138 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.